التفاصيل البيبلوغرافية
| العنوان: |
LES-DEM Investigation of Dense Flow in Circulating Fluidized Beds. |
| المؤلفون: |
Luo, Kun, Yang, Shiliang, Tan, Junhua, Fan, Jianren |
| المصدر: |
Procedia Engineering; 2015, Vol. 102, p1446-1455, 10p |
| مصطلحات موضوعية: |
FLUIDIZED bed reactors, GAS-solid interfaces, DISCRETE element method, GAS flow, HEAT exchangers |
| مستخلص: |
In the Eulerian-Lagrangian framework, the dense gas-solid motions in the conceptually-similar gas-solid fluidizing system — internally circulating fluidized bed (ICFB) and circulating fluidized bed (CFB) are modeled using discrete element method coupled with large eddy simulation. In the coupling procedure, the gas motion is resolved at the computational cell level while solid motion is tracked each individually. After validating the proposed model, the intrinsic mechanisms governing the internal movement of gas-solid phases are explored. In the ICFB, the vertical component of gas or solid flux is extremely larger than its lateral one. Large flux of gas phase mainly concentrates in the right region of each chamber. Vigorous transportation of solid phase locates in the two sides of the reactor chamber. The falling intensity of solid motion near the wall of heat exchange chamber enlarges along the bed height. In the CFB, typical internal circulation property of solid phase can be observed in the riser. Moreover, non-uniform distributions of gas-solid properties appear in the riser especially the bottom region of this component. Strong back-mixing of solid phase can be observed in the vicinity of wall. [ABSTRACT FROM AUTHOR] |
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